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Lewis Hamilton will join Mercedes from next season on a three-year contract.

The decision to leave McLaren after a 14-year association with the team has been described by one source close to Hamilton as "the toughest of his career".

In a statement Hamilton said: "It is now time for me to take on a fresh challenge and I am very excited to begin a new chapter racing for the Mercedes Formula One Team. Mercedes-Benz has such an incredible heritage in motorsport, along with a passion for winning, which I share."